Verilink PRISM 41TDM (34-00275.4) Product Manual - Manual (Page 33)

Diagnostics 25
Diagnostics The Diagnostics screen allows testing functions to be performed on the network or
the DTE port. The unit recognizes inband loopback requests as well as local testing
and remote network management loopback test commands. The PRISM 41TDM
has an internal 511 pattern generator and comparator. The unit can transmit the
pattern toward the DDS line/network or toward the data port/DTE interfaces. Bit
Error Rate testing is available on Port B only when the unit is set to TDM mode.
shows the Diagnostics menu structure.
Loop Mode Allows choosing how data is looped back. The options are Bidirectional and
Unidirectional.
BERT Function The following menus offer selections for starting a BERT (Bit Error Rate Test)
along with test results.
BERT
This selection allows setting the BERT to Off, Net, DTE A - Net, DTE A - DTE,
DTE B - Net, or DTE B - DTE.
Off - Shuts down any BERT currently running.
Net - Initiates a full bandwidth BERT towards the DDS network. Because the
BERT takes up the entire DDS bandwidth, the FDL function (if active) is
interrupted.
DTE A - Net - In DDS-I or DDS-II mode, there is no discernible difference
between this selection and Net. However, in TXP-I or TXP-II mode, this menu
selection initiates a BERT that does not interfere with the FDL (or other DTE port,
if active).
DTE A - DTE - Initiates a BERT towards the DTE port A. DTE port B (if in TDM
mode) is not affected.
DTE B - Net - In DDS-I or DDS-II mode, there is no discernible difference
between this selection and Net. However, in TXP-I or TXP-II mode, this menu
selection initiates a BERT that does not interfere with the FDL (or other DTE port,
if active).
Table 3-6 Diagnostic Menu
Loop
Mode BERT
Function Local
Loop Far V.54
Loop V.54
Loop DTE-A
Loop DTE-B
Loop
Uni
Bi BERT Reset Sync
Loss Errored
Seconds Bit Error Time Sync Off
On Off
On Off
On Off
On Off
On
Off
Net
DTE A - Net
DTE A - DTE
DTE B - Net *
DTE B -
DTE *
Yes
No display
only display
only display
only HH:MM:SS
display only In Sync (display only)
No Test (display only)
* TDM mode only.